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    <p><strong>Initialization</strong> is creating an instance(of type) with certain value.</p> <pre><code>int i = 0; </code></pre> <hr> <p><strong>Assignment</strong> is to give value to an already created instance(of type).</p> <pre><code>int i; i = 0 </code></pre> <h2>To Answer your edited Question:</h2> <p><em><strong>What is the difference between Initializing And Assignment inside constructor? &amp;<br> What is the advantage?</em></strong> </p> <p>There is a difference between Initializing a member using initializer list and assigning it an value inside the constructor body. </p> <p>When you initialize fields via initializer list the constructors will be called once. </p> <p>If you use the assignment then the fields will be first initialized with default constructors and then reassigned (via assignment operator) with actual values.</p> <p>As you see there is an additional overhead of creation &amp; assignment in the latter, which might be considerable for user defined classes. </p> <p>For an integer data type or POD class members there is no practical overhead.</p> <hr> <p><strong>An Code Example:</strong> </p> <pre><code>class Myclass { public: Myclass (unsigned int param) : param_ (param) { } unsigned int param () const { return param_; } private: unsigned int param_; }; </code></pre> <p>In the above example: </p> <pre><code>Myclass (unsigned int param) : param_ (param) </code></pre> <p>This construct is called a <strong>Member Initializer List</strong> in C++.</p> <p>It <strong>initializes</strong> a member <code>param_</code> to a value <code>param</code>.</p> <hr> <p><em><strong>When do you <code>HAVE TO</code> use member Initializer list?</em></strong><br> You will have(rather forced) to use a Member Initializer list if: </p> <p>Your class has a reference member<br> Your class has a const member or<br> Your class doesn't have a default constructor</p>
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    2. COTypes typically do have a _range_ of values. `void` is the exception, though.
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